On Mon, Sep 22, 2014 at 06:18:31AM +0000, Antti Kantee wrote:
> I'd guess the key to success would be to support genfs_ops in puffs so that
> the file server is consulted about block allocations.
It seems I just have to call GOP_ALLOC in puffs_vnop_write()
(see below) and implement puffs_vnop_fallocate(). Since having
VOP_FALLOCATE() in FFS looks difficult in the near future,
libperfuse turns it into big writes to the file, which fail on
EDQUOT or NOSPC. That way failure is produced before data enter
the page cache, which is what we were looking for.
Opinion?
--- puffs_vnops.c.orig 2014-09-27 06:30:02.000000000 +0200
+++ puffs_vnops.c 2014-09-27 06:30:13.000000000 +0200
@@ -2342,8 +2342,14 @@
*/
if (ap->a_ioflag & IO_APPEND)
uio->uio_offset = vp->v_size;
+ origoff = uio->uio_offset;
+ error = GOP_ALLOC(vp, origoff, uio->uio_resid,
+ 0, curlwp->l_cred);
+ if (error)
+ goto out;
+
while (uio->uio_resid > 0) {
oldoff = uio->uio_offset;
bytelen = uio->uio_resid;
--
Emmanuel Dreyfus
[email protected]
